tregar
Rising Star
Trips here at the forum posted:
This works.Hey all. A very close friend of mine asked me to report on a 'presumed' successful THH "synthesis". (Simple reduction) There were some bumps along the way, but it all worked out well. This is awful laboratory technique.
Used many peganum harmala seeds, salted out ala Manske, then performed an A/B on the Manske Product.
The resulting 4.8 g tannish powder was dissolved in enough 10% HCl to completely dissolve it and put on a hot plate with a reflux condenser. The mix was brought to a boil. Zinc powder was slowly added to the round bottom flask, and given time to boil and fizzle before more was added. Zinc continued to be added over the course of an hour until fizzing stopped. ~50 mL 10% HCl was added and more zinc was slowly added. Anytime one of the reagents was clearly expended, more of it was added (very scientific of him, eh?). Eventually, the dark red colour of the mix turned yellow, then clear with just the faintest hint of pale baby yellow. This was left to continue fizzing away for an hour or so.
When it became obvious that the compound was not getting any lighter in colour, a few scoops NH4Cl was added and the whole mix was filtered through celite (...you don't have celite and a fritted funnel? Then a coffee filter lol) and the alkaloids were extracted with six additions of ~75 mL Ethyl acetate. The ethyl acetate was rotovapped. (What, you don't have a rotovap? Food Dehydrator'ed then.... lol). Dirty brown goo was left behind. 10% HCl was added and this was shaken (awful technique) this resulted in a disgusting coloured nasty chunky liquid. This was rotovapped. To aid the the drying process, blasts of DCM were added to the round bottom periodically and shaken.
This refused to dry (due to the awful technique of acidifying with aqueous) and so the brown glob had ~75 mls of ethyl acetate and 75 mls DCM added. It was shaken vigorously. Everything but the good stuff went into solution leaving brown liquid and white crystals. These were filtered and washed with DCM. These crystals were taken up in 150 mLs of isopropanol/methanol in a 50:50 ratio. This was refluxed and once it began boiling, water was slowly added dropwise and given time to resume boiling until everything was dissolved and the solution was clear. The hotplate was turned off and almost immediately, beautiful fractally snowflake crystals began to form. The flask was allowed to cool to room temp and then put in the freezer. 150 mls of isopropanol were also put in the freezer.
When everything was cold, the crystals of the flask were filtered out and washed with the cold iso. Beautiful shimmering perfectly white crystals resulted. These were weighed and found to have a mass of ~3.5 grams. Thin Layer Chromatography revealed that the compound was indeed distinct from either harmine or harmaline. No NMR was run. Bioassay revealed good times and despite the huge amounts of coffee my friend had been drinking, no hypertension was noted, which most definitely would not be the case had it been harmine/harmaline.
A much more effective and much faster technique involved taking the ethyl acetate fractions and adding methanolic Hcl (made from methanol + acetyl chloride). The compound fell out of solution immediately, in similar yield and was filtered and recrystallized as outlined above.
I've lost all my stir bars but one over 4 weeks.